Building an extension checklist

Building an extension checklist

When planning an extension, it’s important to make sure you have all the necessary information and items covered. This checklist will help you make sure you don’t forget anything!

What are the stages of building an extension?

It is so important to be prepared when building an extension so having a checklist is  super important

Before you start any building work on your extension, you need to submit a planning application to your local authority. This is to ensure that the work you’re planning complies with the Building Regulations.

Your planning application should include:

-A site plan

-Floor plans


-A design and access statement

-The required fee

Once you have received planning permission, you can start work on your extension. The first stage is to prepare the site, which includes excavation and foundation work. Once the foundations are in place, you can start building the walls and roof of your extension. Once the shell of the extension is complete, you can move on to the internal work, such as fitting the windows, doors, and electrics. Finally, you can finish off the extension by adding the finishing touches, such as flooring, tiling, and decorating.

Now that you know the stages of building an extension, here is a helpful checklist to make sure you have everything covered

Building an extension - where to start

okay, that was a quick, vague run though. so here below is a WAY more detailed checklist of things to prepare for.

so let's start from the beginning.  

You've decided you want to extend your home. The first thing you need to do is figure out what kind of extension you want. Do you want a single-storey or double-storey extension? Do you want to extend outwards or upwards?

if you're doing a single story then you don't need support beams but if you're going double story then you WILL need support beams but you also have the option of going upwards.

but what if it's a double-story house already, then you will need support beams FOR SURE.

You also need to decide on the size of the extension. How much extra space do you need? Will the extension be for additional living space, such as a new kitchen or dining room? Or will it be for extra storage space, such as an extra bedroom or bathroom?

if it's a new living space Melbourne regulation requires you to have at least 2.4m high ceilings but if it's just extra storage then you can get away with smaller ceiling heights.

but if it's a new kitchen then Melbourne regulation requires you to have at least a 3m by 2.4m work triangle, which is the distance between your fridge, sink, and oven.

for extra storage space, Melbourne regulation requires you to have at least a 1.8m by 1.5m doorway, an extra bedroom requires a minimum floor area of 9 square metres, and an extra bathroom requires a minimum floor area of 6 square meters.

Make sure you always check your local government website for regulations, as this will vary depending on your location. You may need to get planning permission even if you don’t need to follow the Building Regulations.

If you're planning an outward extension, you will need to make sure that the new building is in line with the rest of your house. The walls and roof should be the same height as the existing house, and the windows and doors should be in the same position.

When you have decided what type of extension you're going to build, you can start sketching out your plans. This will help you figure out the size and shape of the extension, and how it will fit in with the rest of your house.

Choose your design carefully: An extension is a big investment, so make sure you choose a design that you are happy with and that will add value to your home.

It is always a good idea to consult with a professional before starting any building work. They can help you figure out what type of extension you need, and they can ensure that the extension complies with the Building Regulations too.

Once you have your extension plans approved, you can start the building process. Make sure you have all the necessary tools and materials and follow the instructions carefully. If you are not confident doing the work yourself, it is always a good idea to get a professional to help you.

Do I need a builder or an architect?

A builder is someone who will help you construct the physical extension, while an architect will help you design the extension and make sure it complies with the Building Regulations.

A builder can also provide and manage the tradies required for the construction of your extension. Make sure you get a builder who is experienced in building extensions, as this will ensure that the construction process goes smoothly.

An architect is not only competent in designing exterior extensions but can also help with the design of your interior spaces. This will ensure that your extension flows seamlessly with the rest of your house.

Extension material list

You might wonder what material to use for your extension. Brick is a popular choice, as it is durable and looks good. Alternatively, you could use timber, which is a more affordable option and can add a rustic charm to your home.

An architect or builder can advise you not only on the design and planning of your extension but also on the best materials to use and the best way to comply with the Building Regulations. They can also help you get planning permission if needed.

Be prepared for disruption: Extension work can be disruptive, so it is important to be prepared for dust, noise, and mess. Make sure you have somewhere to stay if the work is going to be particularly disruptive.

How do you calculate the cost of an extension?

Another important aspect of building your extension is your budget. Make sure you have a realistic idea of how much the extension will cost, and make sure you have enough money to cover the costs. This includes the cost of materials, the cost of labor, and the tradesman required to get the job done effectively.

Set a budget: Extension work can be expensive, so it is important to set a realistic budget and get quotes from several different builders before starting work.

When choosing a builder, it is important to be careful and do your research. Make sure you get quotes from several different builders and compare their prices and services. It is also important to check that the builder is qualified and experienced in building extensions.

Check for hidden costs: Extension work can come with hidden costs, so make sure you factor in things like planning permission fees, building regulations approval fees, and VAT. VAT stands for Value-Added Tax, which is an extra tax that you have to pay on top of the cost of your extension.

Time to build an extension

There is no one-size-fits-all answer to this question, as the time required to build an extension will vary depending on the size and complexity of the extension. However, a good rule of thumb is that it will take around 6-8 weeks to build an average-sized single-story extension.

Double-story extensions will typically take longer to build, as they are more complex. It is a good idea to allow around 12-16 weeks for the construction of a double-storey extension.

There is no one definitive answer to this question, as the best time to build an extension will vary depending on your specific situation. However, in general, it is best to build an extension during the warmer months of the year, when it is less likely to rain and there is less chance of bad weather disrupting the construction process.

Do I need my Neighbours permission to build an extension?

It is important to consult your neighbors before starting work on an extension, as they may be affected by the construction process. You might need to obtain their permission before starting work, and you may need to agree on certain aspects of the construction, such as the hours of work and the type of material used.

If your house shares a wall with your neighbors, it is important to check your local government's building Regulations for Extensions. These regulations set out specific requirements for the design and construction of extensions, and it is important to comply with them to avoid any legal issues.

so to conclude here is the above checklist to cover of before starting

step 1) choose your design

step 2) consult an expert

step 3) submit plan for permission approval

step 4) create a budget

step 5) factor in hidden cost

step 6) give yourself enough time

step 7) check with neighbours.

In order to avoid any stressful surprises later on, be sure to go over this checklist before starting to build your extension. This way you can be sure that you have everything covered.

Extensions can be a great way to add extra space and value to your home. However, they are a big investment, so it is important to do your research before starting work. Make sure you consult with professionals, set a realistic budget, and choose the right design and materials. By following our helpful checklist, you can make sure that your extension is a success!

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